<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  

  <script>

    let score = Number(prompt('考多少啊'))

    if (score >= 90) {
      alert(`拿了个A,牛逼！`)
    } else if(score >= 80) {
      alert(`还可以，拿了个B`)
    } else if (score >= 70) {
      alert(`C，一般般啊`)
    }else if(score >= 60) {
      alert(`D啊，童鞋很危险啊`)
    }else if(score >= 0) {
      alert('E，等着补考吧')
    }else {
      alert('神仙')
    }
  </script>
</body>
</html>